Class A and B Clearances

When asbestos-containing material is to be removed, proper control measures need to be put in place. WorkSafe NZ has stipulated that an asbestos clearance must take place following any licensed asbestos removal works. The clearance inspection must be undertaken by either a licensed asbestos assessor (Class A) or a competent person (Class B) to ensure the works have been done to a satisfactory industry standard. These two classifications have been clearly identified by WorkSafe NZ and have clear boundaries around what constitutes each. The information below summarises this.

What asbestos can be removed?

Class A

Any type or quantity of asbestos or asbestos-containing material, including:

  • any amount of friable asbestos or ACM
  • any amount of asbestos-contaminated dust or debris (ACD)
  • any amount of non-friable asbestos or ACM.

Class B

  • Any amount of non-friable asbestos or ACM.
  • ACD associated with removing any amount of non-friable asbestos or ACM.

No licence required

Up to and including 10m2 of non-friable asbestos or ACM, cumulatively, over the whole course of the removal project for the site.

ACD that is:

  • associated with removing 10m2 or less of non-friable asbestos or ACM

  • minor amounts of ACD, not associated with the removal of friable or non-friable asbestos.

Air clearance work is an essential part of Health and Safety as it informs the assessors as to whether respirable asbestos fibres are in the area.

A competent person means a person who has acquired, through training and experience, the knowledge and skills of relevant asbestos removal industry practice and who holds;

  1. a certificate for an asbestos assessor training course specified by WorkSafe, or
  2. a tertiary qualification in occupational health and safety, occupational hygiene, science, or environmental health.
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